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J Appl Physiol 92: 1045-1052, 2002. First published November 16, 2001; doi:10.1152/japplphysiol.00706.2001
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Vol. 92, Issue 3, 1045-1052, March 2002

Effect of exercise intensity on 24-h energy expenditure and nutrient oxidation

Edward L. Melanson, Teresa A. Sharp, Helen M. Seagle, Tracy J. Horton, William T. Donahoo, Gary K. Grunwald, Jere T. Hamilton, and James O. Hill

Center for Human Nutrition, University of Colorado Health Sciences Center, Denver, Colorado 80262

The aim of this study was to determine the effects of exercise at different intensities on 24-h energy expenditure (EE) and substrate oxidation. Sixteen adults (8 men and 8 women) were studied on three occasions [sedentary day (Con), a low-intensity exercise day (LI; 400 kcal at 40% of maximal oxygen consumption) and a high-intensity exercise day (HI; 400 kcal at 70% of maximal oxygen consumption)] by using whole room indirect calorimetry. Both 24-h EE and carbohydrate oxidation were significantly elevated on the exercise days (Con < LI = HI), but 24-h fat oxidation was not different across conditions. Muscle enzymatic profile was not consistently related to 24-h fat or carbohydrate oxidation. With further analysis, it was found that, compared with men, women sustained slightly higher rates of 24-h fat oxidation (mg · kg FFM-1 · min-1) and had a muscle enzymatic profile favoring fat oxidation. It is concluded that exercise intensity has no effect on 24-h EE or nutrient oxidation. Additionally, it appears that women may sustain slightly greater 24-h fat oxidation rates during waking and active periods of the day.

whole room calorimeter; gender differences; fat oxidation; body weight regulation


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